I do think there's some truth in that or at least there was. I had some therapy over the years where I went in pretty much with the 'oh my life has been so hard' spiel but in my last course I went in with 'some of my behaviours, whilst explainable by my upbringing, are not excusable because of it' (tip of the hat to Mumsnet for highlighting some).
The therapy was compassion focussed in nature which on paper sounds like therapy that's all about having your therapist feel sorry for you. In fact it wasn't at all. I had to own my shit and bring to the surface just how much I hated myself and why that led to shame and self attack and why I behaved in certain ways to avoid shame and gain validation from others. Post therapy I'd say I like myself more than I have ever done, am much better at recognising pulls to past behaviour, and a lot of shame over past actions has shifted to guilt (from desire to hide from what I have done to desire to make amends if that is what the other wants. I'm OK with them telling me to get to fuck if that is also what they want)
So I don't think I'm staying because just I want people to feel sorry for me although I'll admit it can be nice for a short while, most people like a kind word. I know full well that if I don't leave and bang on about it, people rightly move away from feeling sorry for me to exasperation with me.
I stay because whilst I can picture me in a small flat on my own, poor but happy and able to do what I want, walk a lot, go to museums, go on walking holidays just me and my tent, see friends when I want, join a book club and most of all not bother with any form of relationship, all without walking on eggshells, I also picture something else.
That is W really struggling on her own having lost her support as well as the lifestyle she wants. I listen to her rants and moans about work and the colleagues she doesn't get on with. I have always done the housework, organised the trips, done the 'life admin'. Could she do this without me? I don't know, she has said she could but also tells me about her failing memory, how tired she is, how being seriously ill a year or so ago has damaged her. Her family are dysfunctional and unlikely to support her and it seems cruel for me to leave her on her own and cruel to me to stay.
And also, she is usually nicer to me when she thinks I might leave. Things feel a little better and I think now isn't the time. Then there'll be something, a moment or a horrible confrontation and the cycle repeats. Is that trauma bonding? I don't know. It is what it is and it's a bit shit but although I like the metaphor that a bit of shit in your soup ruins it all, I'm sort of spooning around it. And although I'm not at all religious I broke one set of marriage vows to end up with W and doing it again doesn't sit lightly with me.